The iMac G5, powered by the PowerPC G5 processor, was originally released in 2004.

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iMac doesnt turn on anymore

Hi, after I was able to fix my iBook I wanted to give it a try and try to fix my iMac too.

The problem I had was that it doesnt turn on anymore. When it started, I had to press the power button several times and it turned on. With the time I had to press more often til it didnt turn on at all.

I did the test on the apple support page and reseted the SMU. First I got it to work again, but then it stopped again. When I plug it in the AC adapter it gets energy, the 1. LED light is on. When I press the reset button on the logic board, no other light shines on.

Does anybody know that problem and could help me with it? If there are any other questions, please just ask.

Greetings from Berlin, Anna

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The iMac G5 had some pretty major problems with bad capacitors. If you open up your iMac, look for little black cylinders on the board. Do any of them look like the ones in this picture? If there are any that are bulging out, that could be your problem.

If you don't see any bulging caps, it could be that your power supply has blown, due to similar bad capacitors. You could look at replacing the power supply, but that can get expensive, and it comes with the risk of the new supply dying as well, due to the same problem.

If you are really, really good with a soldering iron, you may be able to replace the capacitors yourself. Be advised that this is definitely an advanced project. Here's a good website for getting an overview of what you'd be getting yourself into:

I hope that helps!

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+ if the caps look good replacing the power supply should give you at least another year on the machine.


Hi Josh,

first, thank you for your answer. I checked all the capacitors and they look fine. No bulging caps. I will see, if I can find a new power supply and try this.

For any other advice I am very open.



To get instructions for replacing the power supply go here and select your model, then follow the link to the power supply replacement. iMac G5 Repair


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